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Finding the Fourth Proportional to 7,181.88, 10,772.82 and 1,987.75

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Solution

The fourth proportional to 7,181.88, 10,772.82 and 1,987.75 is: 2,981.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,181.88 : 10,772.82 = 1,987.75 : x
  2. Step 2: Convert to fraction form
    7,181.88/10,772.82 = 1,987.75/x
  3. Step 3: Cross multiply
    7,181.88x = 10,772.82 × 1,987.75
  4. Step 4: Simplify right side
    7,181.88x = 21,413,672.96
  5. Step 5: Solve for x
    x = 21,413,672.96/7,181.88
  6. Step 6: Final answer
    x = 2,981.63

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.